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arxiv: 2606.05897 · v1 · pith:2ASSJ7V4new · submitted 2026-06-04 · ✦ hep-ex

Higgs CP studies and other Higgs properties at ATLAS and CMS

Lucas Russell (for the ATLAS , CMS Collaborations) This is my paper

Pith reviewed 2026-06-27 23:14 UTC · model grok-4.3

classification ✦ hep-ex
keywords Higgs bosonCP propertiesmass measurementwidth measurementYukawa couplingvector boson couplingLHC data
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The pith

ATLAS and CMS report updated measurements of the Higgs boson mass, width, and CP properties from 13 and 13.6 TeV LHC data.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper summarizes recent results from the ATLAS and CMS experiments on properties of the Higgs boson. CMS provides measurements of the mass and width in the diphoton decay channel along with a width measurement in the WW star final state. ATLAS contributes a combined measurement of the charge-parity nature of the Higgs couplings to vector bosons, with both experiments adding improved results from individual channels. CMS also presents its latest analysis of the CP structure in the Higgs coupling to tau leptons. These measurements use proton-proton collision data to characterize the Higgs boson in greater detail.

Core claim

The central results are CMS measurements of the Higgs boson mass and width in the H to gamma gamma channel together with a width measurement in the H to WW star final state, a combined ATLAS measurement of the charge-parity nature of the Higgs-vector boson couplings along with improved individual channel results from both experiments, and the latest CMS analysis of the CP structure of the Higgs-tau lepton Yukawa coupling, all based on data recorded at 13 TeV and 13.6 TeV.

What carries the argument

Event selection and statistical extraction in the H to gamma gamma, H to WW star, and Higgs-tau decay channels to determine mass, width, and CP-sensitive observables such as coupling modifiers or mixing parameters.

If this is right

  • The combined CP measurement constrains possible admixtures of CP-odd components in the Higgs-vector boson interactions.
  • The width measurements in the diphoton and WW channels provide independent determinations of the Higgs total decay width.
  • The updated mass value in the diphoton channel supplies a refined reference for studies of other Higgs properties.
  • The CP analysis in the tau Yukawa coupling extends tests of charge-parity properties into the fermion sector.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • These channel-specific results could be combined across experiments to produce tighter overall limits on CP violation in the Higgs sector.
  • Consistency between the reported widths and Standard Model expectations would support the absence of unexpected decay modes at current precision.
  • Future data at higher integrated luminosity could resolve smaller CP-violating effects that remain below sensitivity in the present analyses.
  • The measurements establish reference values that theoretical models of Higgs extensions must reproduce to remain viable.

Load-bearing premise

The analyses rely on accurate modeling of backgrounds and detector response in each decay channel.

What would settle it

A statistically significant deviation from zero in the CP-odd mixing parameter extracted from the combined ATLAS Higgs-vector boson coupling analysis would contradict the reported consistency with CP-even structure.

read the original abstract

Recent measurements of Higgs boson properties using proton-proton collision data recorded at $\sqrt{s}=13$ TeV and $\sqrt{s}=13.6$ TeV with the ATLAS and CMS detectors at the LHC are presented. CMS results on the Higgs boson mass and width in the $H\to\gamma\gamma$ channel are reported, together with a measurement of the Higgs boson width in the $H\to WW^*$ final state. A combined measurement of the charge-parity (CP) nature of the Higgs-vector boson couplings by the ATLAS collaboration, as well as improved results in individual channels by both experiments are summarised. Finally, the latest CMS analysis of the CP structure of the Higgs-tau lepton Yukawa coupling is reported.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 2 minor

Summary. This manuscript summarizes recent ATLAS and CMS measurements of Higgs boson properties from proton-proton collisions at 13 and 13.6 TeV. It reports CMS results on the Higgs mass and width in the H to gamma gamma channel and the width in the H to WW* channel, a combined ATLAS measurement of the CP nature of Higgs-vector boson couplings together with improved channel results from both experiments, and the latest CMS analysis of the CP structure of the Higgs-tau Yukawa coupling.

Significance. These results provide updated experimental constraints on the Higgs mass, width, and CP properties. If they hold, they strengthen tests of the Standard Model Higgs sector and limits on possible CP-violating effects, with the multi-experiment combination adding robustness to the conclusions on HVV and Htautau couplings.

minor comments (2)
  1. The manuscript should include explicit citations to the original ATLAS and CMS publications for each summarized result so that readers can access the full analysis details, data selections, and systematic uncertainty breakdowns.
  2. Specify the integrated luminosities corresponding to each individual measurement or channel result to provide context for the precision achieved.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive review of the manuscript and their recommendation to accept.

Circularity Check

0 steps flagged

No circularity: experimental summary with no derivation chain

full rationale

The document is a conference-style summary reporting ATLAS and CMS experimental measurements of Higgs mass, width, and CP properties in specified channels. No equations, ansatze, predictions, or derivations are present that could reduce to fitted inputs or self-citations by construction. All content consists of citing and summarizing collaboration results based on proton-proton collision data, with no internal modeling steps or load-bearing self-references that would trigger any of the enumerated circularity patterns. The paper is self-contained against external benchmarks as a reporting document.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

No theoretical free parameters, axioms, or invented entities are introduced; the document is an experimental summary relying on prior Standard Model assumptions and detector calibrations not detailed here.

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discussion (0)

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Reference graph

Works this paper leans on

7 extracted references · 1 linked inside Pith

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    ATLAS Collaboration, arXiv:2603.20117 (2026)

    arXiv 2026

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    arXiv 2026

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